Embedded quotes can be expressed as indirect quotes. Alternate translation: "Go through the camp and command the people to prepare provisions for themselves. In three days they will cross over this Jordan and go in and possess the land that Yahweh their God is giving them to possess." (See: [[rc://en/ta/man/translate/figs-quotesinquotes]])
"cross over" refers to going to the opposite side of the river. Alternate translation: "travel to the other side of the Jordan River" (See: [[rc://en/ta/man/translate/figs-idiom]])